It's curious that people on this forum think Iran has the right to develop their own nuclear weapons without consequences, at same time they think it's wrong that USA and its allies try to suppress this threat, considering western countries are going to be the main targets of Iran and its sympathizers, in case they succeed growing stronger.
It would be a stupid move from western countries to let their self-declared enemies continue accumulating more military power just to be annihilated in the end. And hypothetically, in case that happened, these same people who are blaming and morally disapproving USA and Israel right now, would just say: "they deserved it all the time".
This is not democratic nor peaceful, the 2 things the countries you list talk about the most. You can't control the whole world, and trying to do so will only result in severe consequences in the long term. Unfortunately, most people are no longer capable of thinking long term..